<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>定时器</title>
</head>
<body>
  <script type="text/javascript">
  	
  	 var timer = setTimeout(function(){
  	 	  alert("66666");
  	 },1000)

  	 console.info(timer)
     console.info(typeof timer)

  </script>
</body>
</html>